My family and I still depend on cars. There is no way to get them around otherwise.
My wife cannot even ride a bike due to severe arthritis, and cannot walk to the bus stop for the same reason.
But as John E. said, small cuts in oil consumption can make a big difference if more people make the "sacrifice." I don't consider it a sacrifice to ride my bike to work, I just love it! Especially since I remember how much it cost me to commute by car during the first 20 years of my worklife!
Metro Atlanta Rapid Transit Authority estimated that the average Atlantan who commutes by car (formerly, me) spews almost two tons of exhaust gasses into the city's air every year.
I breathe a little easier, now.
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No worries